power trim

Power trim started working slow coming up. It went down at normal speed. I opened plug and fluid looked white and watery. Put new ATF in and lifted up and down bunch of times to remove air. It worked great for 6-7 times in yard and thought it was fine. Let boat sit for a couple months and now it will not go up or down. Batteries are charged and everything else is working fine. Did it have water and leak? Fluid is milky again. Motor had been left in down position.

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May 30, 2011
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Power Trim
by: Anonymous

ATF or most any hydraulic fluid looks milky after being cycled due to minute air bubbles in the fluid. I'm not sure why, but it just does this. It does it in heavy equipment the same as it does in boat power trim. Hydraulics are hydraulics. It has no effect on the performance of your trim unit.

May 29, 2011
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Try tilting it up when you fill.
by: Anonymous

I had the same problem. I flushed it and then removed the bottom pin so I could rotate it up and get it fuller. This helped to get all the air out. Air and or water can make the oil milky looking. On mine, you had to fill it with the ram extended and then replace the filler plug (with the ram extended) for proper operation. Water WILL damage the check valves. get it out. BTW Mercury 115 single ram with motor attached.

Nov 14, 2010
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Trim & Tilt
by: Anonymous

Hydraulic fluid after being used a few times gets milky and stays that way. Not sure why, but thats just the way it works. Does the same in my tractors and backhoe. Check your manufacturers recommendations on the type of hydraulic fluid to use. Sometimes ATF fluid just isn't the correct kind. It may work for awhile, but not for long.

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